package com.atguigu.servlet;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

public class UploadServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       //1.先判断上传的数据是否是多段数据（只有是多段的数据，才是文件上传的）
        if(ServletFileUpload.isMultipartContent(req)){
            //创建FileItemFactory工厂实现了
            FileItemFactory fileItemFactory = new DiskFileItemFactory();
            //创建用于解析上传数据的工具类ServletFileUpload类
            ServletFileUpload servletFileUpload = new ServletFileUpload(fileItemFactory);
            //解析好上传的数据，得到每一个表单项 FileItem
            try{
                List<FileItem> list = servletFileUpload.parseRequest(req);
                //循环判断，每一个表单项，是普通类型，还是上传的文件
                for(FileItem fileItem:list){
                    if(fileItem.isFormField()){
                        //普通表单项
                        System.out.println("表单项的name属性值："+fileItem.getFieldName());
                        //参数UTF-8  解决乱码的问题
                        System.out.println("表单项的value属性值"+fileItem.getString("UTF-8"));
                    } else{
                        //上传的文件
                        System.out.println("表单项的name属性值："+fileItem.getFieldName());
                        System.out.println("上传的文件名"+fileItem.getName());
                        fileItem.write(new File("e:\\"+fileItem.getName()));
                    }
                }
            } catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}
